S E O stands for Search Engine Optimization
Crawler
Index
Search engine software
Crawler:
It is also called the spider. The spider visits a web page, reads it, and then follows links to other pages within the site. The spider will return to the site on a regular basis, such as every month or every fifteen days, to look for changes
Index:
Everything the spider finds goes into the second part of the search engine, the index. The index will contain a copy of every web page that the spider finds. If a web page changes, then the index is updated with new information
Search Engine Software:
This is the software program that accepts the user-entered query, interprets it, and sifts through the millions of pages recorded in the index to find matches and ranks them in order of what it believes is most relevant and presents them in a customizable manner to the user.
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